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... Tiridaten, si preces ipse attulisset. Syriaeque executio [C.] Ce[s]tio,...

Protasis of a conditional clause in obliqua, with the pluperf. subj. replacing the fut. perf. indicative: "if Tiridates asks (shall have asked), it will not be in vain." Where English idiom uses the present tense in so-called fut. more vivid conditions, Latin uses the fut. perf.